Flashlight lamp



April 14, 1942. P; scHwARzE FLASH LIGHT LAMP Filed May 16, 1959 Patented Apr. 14, 1942 UNITED STATES PATENT OFFICE FLASHLIGHT LAMP Paul Schwarze, St. Gallen, Switzerland Application May 16, 1939, Serial No. 273,930 r In Germany May 25, 1938 4 Claims.

The invention has for its object an improvement of flashlight lamps of the type in which light is produced by the reaction of suitable substances, enclosed in containers which are com posed of at least two parts.

It consists in that the partsare so connected with one another that by interposing a yielding body they can give way one against the other in the sense of an enlargement of the combustion space.

Two embodiments are shown, by way of example, in the drawing in which Fig. 1 is a sectional view of a flashlight lamp according to this invention; and

Fig. 2 is a similar representation showing a modified form. In Fig. 1 the container I has the form of a box and is closed in a gas-tight manner by the window 2 with the aid of the sealing compound 6. For this purpose, the box is provided at the top with a lateral projection 3. 4 and 5 are threaded rings by which the container and.

layer may, for example, also be a spiral springled around the vessel. It can also be arranged in other ways, e. g., above the window and it can be united into one piece with the packing B. 8 is a thin insulating layer, e. g., pressboard and 9 a flat metal piece which is connected with the wire 10. To the latter is secured the igniting wire H, which is connected at its other end with the vessel itself, if the latter consists of conductive material. The box is filled with a light-giving substance, e. g., metal foils, and a gas, e. g., oxygen, which promotes the reaction. I3 is an aperture ior evacuating the lamp and filling it with the gas and I4 is the solder or sealing compound with which the aperture is closed thereafter. The arranging of the sealing material in the recess avoids it being knocked off during transport and use.

In Fig. 2 the container consists of the glass tube I5 which is closed at its upper end and of which the lower open end has a lateral projection 16. It is sealed by the metal lid H with the aid of the sealing compoundii and with the interposition of the layer 1. The tube and lid are held together by the ring l8 which may also consist of two threaded parts as in Fig. 1. The layer 1 allows a yielding of the tube and lid in the manner described. The lid I1 is supplied with a screw socket IQ for use of the flashlamp with pocket lamps.

Tests have shown that it is possible to make such flashlight lamps, even if they are filled with oxygen at atmospheric pressure, of comparatively thin material without fear of bursting if their parts are connected together in such a manner that, when the pressure of combustion occurs, a yielding in the sense of a separation of the parts or of an enlargement of the combustion space is possible. An actual separation and an escape of gas does not, as a rule, take place, but only in case of excessive pressure. It is generally suflicient for effectively intercepting the sudden combustion pressure, which is immediately followed by a reduced pressure, if the yielding can take place to quite a small extent. The packing or sealing compound 6 can therefore be so suited to the intermediate layer 1 that the yielding has no detrimental efiect on the gas-tight closure. If, however, excessive pressure occurs in consequence, for instance, of the presence of dust or oil particles the yielding takes place to such an extent that slits.are formed between the rim of the window 2 and the projection 3 in Fig. 1 or between the lid l1 and the flange It in Fig. 2, so that gas can escape through these slits.

The object of making the electrode 9 in Fig. 1 as a flat metal piece is to reduce the size of the flashlamp and to eliminate any projecting part. If this embodiment is to be used in conjunction with pocket lamps or holders which are arranged to receive screw sockets, then this can take place with the aid of an intermediate piece which consists of a screw socket provided with resilient side parts between which the flashlight lamp can be inserted and which produce contact, on the one hand, with the wall of the container and, on the other hand, with the disc 9.

What I claim as my invention and desire to secure by Letters Patent of the United States is:

1. Flashlight lamp, comprising a container and a closure member; substances in the container which produce light by reaction; means adapted to hold the container and the closure member together; and a separate yielding body disposed between said means and the rim of the container or closure member in such a way that the container and the closure member can give way one against the other in the sense of an enlargement of the reaction space when the lamp is flashed.

2. Flashlight lamp, comprising a metal box and a glass window; substances in the box which produce light by reaction; means adapted to hold the box and window together; and a resilient ring disposed between said means and the rim of the box or window in such a way that the box and window can give way one against the other in the sense of an enlargement of the reaction space when the lamp is flashed.

3. Flashlight .lamp, comprising a glass tube and a lid; substances in the tube which produce light by reaction; means adapted to hold the tube and lid together; and a yielding body disposed between said means and the rim of the tube or lid in such a way that the tube and lid can give way one against the other in the sense of an enlargement of the reaction space when the lamp is flashed.

4. Flashlight lamp, comprising two parts of which at least one is transparent; one of said parts being a container, the other a closure member; substances in the container which produce light by reaction; means at one of said parts adapted to hold them together; and a compressible body disposed between said means and the rim of one of said parts in such a way that said parts can give way one against the other in the sense of an enlargement of the reaction space when the lamp is flashed.

PAUL SCHWARZE. 

